340 



BOARD OF AGRICULTURE. 



Reverted phosphoric acid 

 Insoluble phosphoric acid 

 Potassium oxide 

 Sand, &c. 



Per cent. 



.78 



.86 



8.95 



.42 



Valuation per ton of two thousand pounds : — 



169 pounds of nitrogen 



148 pounds of soluble phosphoric acid . 

 15.6 pounds of reverted phosphoric acid 

 17.2 pounds of insoluble phosphoric acid 



179 pounds of potassium oxide 



vni. 



Pacific Soluble Guano. 

 (Collected at the warehouse in BoBton.) 



$62 80 



Valuation per ton of two thousand pounds : — 



60.8 pounds of nitrogen 

 150.2 pounds of soluble phosphoric acid . 

 .6 pounds of reverted phosphoric acid 

 129.4 pounds of insoluble phosphoric acid 

 4.8 poimds of potassium oxide 



IX. 



George Upton's Ammoniated Superphosphate. 

 (H. Phelps, Northampton, Mass.) 



Organic and volatile matter 

 Ash constituents 

 Moisture lost at 100° C . 

 Total nitrogen 

 Total phosphoric acid 

 Phosphoric acid soluble in water 

 Reverted phosphoric acid 

 Insoluble phosphoric acid 

 Insoluble matter, sand, &c. 



$39 02 



Per cent. 



53.22 



46.78 



25.96 



2.17 



9.25 



3.64 



4.18 



1.43 



3.13 



